FBX file not importing/invisible
If your scene was empty before the import, it looks like stuff is importing correctly as there are objects in your outliner. My guess is that the scale during import is off. The objects might be there, they're just scaled too big or too small to see. Try using the . key on the numberpad, which centers the view on the selected object.

You can also try re-importing, but in the import options start by changing the scale to 0.1 and if that doesn't work, try a larger number like 10.

You can also find some more info that might help here: how to scale imported .obj and .fbx